If the first three terms in the expansion of \( (a+b)^{n} \) are 729,7290 and 30375 then....

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If the first three terms in the expansion of \( (a+b)^{n} \) are
\( \mathrm{P} \)
729,7290 and 30375 then
(1) \( a=3, b=5 \)
(2) \( a=4, n=6 \)
(3) \( b=5, n=5 \)
(4) \( b=5, n=6 \)


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